Roll tensioning means for duplicating machines



May 17, 1960 E. M. SPRINGER ETAL 2,936,706

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ROLL TENSIONING MEANS FOR DUPLICATING MACHINES Original Filed April 1,1954 10 Sheets-Sheet 2 I I I H.

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ROLL 'rmxsxoumc MEANS FOR DUPLICATING MACHINES Original Filed April 1,1954 10 Sheets-Sheet 3 138 15! Wllufi w jwu'rzfi- FRANCIS K. MOOREEDWARD M. SPRmeER a Hm, DMwfB muw we 'B/w u) m?" May 1960 E. M SPRINGERET AL 2,936,706

ROLL TENSIONING MEANS FOR DUPLICATING MACHINES Original Filed April 1,1954 1o Sheets-Shet .4

JZVZV-lfi] FRANCIS K. MOORE M EDWARD M. SPRINGER E Hm, O

y 1950 E. M. SPRINGER ET AL 2,936,706

ROLL TENSIONING MEANS FOR DUPLICATING MACHINES Original Filed April 1,1954 10 Sheets-Sheet 5 fizz/276752; FRANCIS K. MOORE EDWARD M. SPmNGERi? 4am, MGM

M BMWJ awe y 1960 E. M. SPRINGER ETAL 2,936,706

ROLL TENSIONING MEANS FOR DUPLICATING MACHINES Original Filed April 1,1954 10 Sheets-Sheet 6 jzvevzfiv FRANCIS K. MooRE EDWARD M. SPRINGER y1960 E. M. SPRINGER ETAL 2,936,706

ROLL TENSIONING MEANS FOR DUPLICATING MACHINES l0 Sheets-Sheet 7Original Filed April 1, 1954 jzueqzin FRANcvs K. MOORE EDWARD M.SPRINGER y 1960 E. M. SPRINGER ET AL 2,936,706

ROLL TENSIONING MEANS FOR DUPLICATING MACHINES Original Filed April 1,1954 10 Sheets-Sheet 8 m i fi mw %R N M W ma? 3 u W. 4 2

y 1960 E. M. SPRINGER ETAL 2,936,706

ROLL 'rsusroumc MEANS FOR DUPLICATING MACHINES Original Filed April 1,1954 I 10 Sheets-Sheet 9 45 flxzaez/zzn .51 ERANus K. MOORE DWARD M.SPRINGER Hami -Bylaw May 17, 1960 E; M. SPRINGQER'YET AL 2,936,706

ROLL TENSIONING MEANS FOR DUPLICATING MACHINES lOSheets-Sheet 10Original Filed April 1, 1954 k W. w

I 9) III! *3 az /27th FRANCIS K. MOORE EDWARD M.SPR|NGER awa United VStates Patent ice ROLL TENSIONING MEAN S FOR DUPLICATING i MACHINESOriginal application April 1, 1954, SerialNo. 420,232,

now Patent No. 2,830,534, dated April 15, 1958. Dividetl and thisapplication May 21, 1957, Serial-No. 660,546

6 Claims. (Cl. 101-132.-5)

This application is a division of our copending'applieation Serial No.420,232, filed April 1, 1954, for Duplicating Machine, now US. PatentNo. 2,830,534.

The present invention relates to roll tensioning means for duplicatingmachines.

An object of the invention is to provide a duplicating machinecomprising a rotatable master carrying drum and an impression rollcooperating with the drum in pressing copy sheets against the master andmeans for varying the pressure exerted by the roll in pressing copysheets against the master during a period of operation of the machine.Thus as the imprinted material on the copy sheets be comes less intenseor fainter after a period of use of the master, the pressure of theimpression roll against the drum can be increased from time to time bythe operator for maintaining substantialuniformity in the intensity ofthe duplicated matter upon the copy sheets. By-using less pressurebetween the roll and master when the latter is fresh and increasing thepressure from time to time as the printing of a large number of copiesprogresses, substantial uniformity in the intensity of the imprintedmatter through the entire run can be obtained. T he pressure iantlowered position illustrated, isopen to supply fluid to a transversefluid holding tank;

Fig. 10 is a broken elevational view of the fluid discharge end portionof the tank and of the control valve;

Fig. 11 is a broken elevational view of the control valve 7 shown inlongitudinal sectionin elevated, closed position;

Fig. 12 is a broken transverse sectional elevation taken on line 1212 ofFig. 2 and showing a copy sheet being advanced'from the feed table intothe bight of a moistening and cooperating presser roll;

Fig. 13 is a broken transverse vertical sectional view taken axially ofthe drum and drive shaft.

7 Fig. 14 is a vertical elevational view of the left-hand end of thedrum as viewed in Fig. 2 and manually operable means mounted on theadjacent side frame member for effecting elevation of the master clampcarried by the drum;

:Fig. 15 is a broken end elevational view of the hub structure of thecrank including manually operable adjusting means for adjusting the drumrelative to the shaft and crank for varying the position at which themaster,

'carried by the drum, contacts the copy sheets whereby the location orcalibration of the imprinted matter upon the sheets can be variedlongitudinally of the sheets;

Fig. 16 is a detached broken perspective view of the crank hub as viewedfrom the inner face thereof.

Fig. 17 is a broken sectional view taken on line 17-17 of Fig. 13;

Fig. 18 is a broken elevational view of a portion of the drivingmechanism shown in Fig. 4 but in a relatively different operatingposition;

varying means can be operatively disconnected readily'to release thepressure of the impression roller againstthe. drum and to release'thepressure of a presser roller against a moistening roller also to avoid atendency of the rolls to become flattened when the machineis to remainidle for a period, as overnight or weekends,

Other objects of the invention relate to various features ofconstruction and arrangement of parts which will be apparent from aconsideration of the following specification and accompanying drawingswherein,

.Figure 1 is a perspective view of a machine which is illustrative ofthe present invention, the figure showing side ornamental plates orhousings which enclose certain operative parts of the mechanism; I

Fig. 2 is a broken elevational view of the machine shown in Fig. 1; I

Fig. 3 is a broken verticalsectional view taken on line 33 of Fig. 2; I

Fig. 4 is a side elevational view of thedriving and timing mechanism forthe driven rolls viewed along line44 of Fig. 2, but with the respectiveornamental cover or housing plate removed;

Fig." 5 is a sectional elevational view taken along the line 5-5 of Fig.2, the cover plate being not shown;

Fig. 6 is a broken sectional view of an eccentric cable tensioningstructure taken on line 6--6 of Figs. 3 and 7;

Fig. 7 is a broken elevational view of the eccentric structure shown inFig. 6;

Fig. 8 is a perspective view of a detached spring collar which in useembraces the convolutions of the cable on the eccentric as shown inFigs. 6 and 7;

Fig. 9 is a broken end elevational view of a rockable fluid supply tankand a sectional view of anassociated automatically operable controlvalve which when in the Fig. 19, taken on line 19--19 of Fig. 20, is anaxial sectional view of one of. the two one-way. clutches shown in rFig. 4 which is operative only when driven in one direction and permitsthe driven elements to continue rotation in that direction independentlyof the clutch;

Fig. 20 is a sectional view of a clutch member taken along line 2020 ofFig. 19;

Fig. 21 is a longitudinal sectional view similar to Fig. 9, butillustrating a modified means for selectively adjusting the tank betweenseveral operative positions for varying the level of the liquid in theWick-moistening trough and thus varying the quantity of fluid applied tothe copy sheets; and

I Fig. 22 is a broken top plan view means shownin Fig. 21.

Themachine shown in the drawings is of the hand operable type having acrank 10for rotating a drum 11 which is journalled in theopposed sideframe members or plates of the tank adjusting 12 and 13, which areconnected by transverse tie rods and other elements for giving rigidityto the structure but which,-not being specifically relevant to theinvention hereinafter claimed, are not described in detail. The ma chineas shown in Figs. 1 and 2 has ornamental side case ing members 12a and13a which cover mechanism mounted on the outer surfaces of the framemembers 12 and 13 respectively. The members 12a, 13a need not be Ifurther described nor illustrated.

At one end of the machine is a feed table 14 for holding a supply ofcopy sheets which are fed automatically, in'succession into the machineas it is operated, the rate of feed being one sheet to each cycle ofoperation of the drum. At the other end of the machine is a receivingtray 15 for receiving the imprinted sheets issuing from the machine. Thedrum 11 is provided with a clamp Patented May 17, 1960 forward feedingof the top-most sheet of the stack of copy sheets 17 on the feed table14 until the advancing end of the sheet is pressed into the bight of apair of contacting upper and lower rolls 18 and 19, which at that vinstant are stationary. Rolls '18 and 19 are respectively a moisteningroll and a presser roll. The feeding of the sheets in succession fromthe stack is effected by feed means shown as comprising a pair of rubberfeed wheels 2%) on a shaft 21 which is driven positively at thebeginning of a cycle of operation of the crank 10 from a starting orinitial position to advance the top sheet until the forward end isfirmly fed into the bight of the rolls 18 and 19, whereupon the feedwheels 20 become inactive or non-driven by the mechanism but canfree-wheel in the same rotative direction'as the sheet is advanced bythe rolls 18 and 19. Following the interruption in positive feed of thefeed Wheels 20 and shaft,

21 the rolls 18 and l9become positively driven during the succeedingportion of the same cycle of operation of the drum and advance the sheetbetween said rolls and into the bight between the drum 11 and asubjacent contacting impression roll 22. The roll 18 applies moisture tothe upper surface of the sheet as it advances between the rolls 18 and19. As the forward end of the sheet passes into initial engagementbetween the rotating drum 11 and impression roll 22, the rolls 18 and 19are de-clutched from the drive mechanism as later explained but arerotatable in the same direction by the remainder of the sheet beingdrawn forwardly by reason of the engagement thereof by the drum andimpression roll. Hence moisture is applied to the sheets as they pass incontact with roll 18 but as a, sheet has passed out of engagement of therolls 18 and 19, their rotation halts until positively driven during thecorresponding portion of the next cycle. The interruption of theoperation of the rolls 18 and 19, as stated, avoids the needless anddisadvantageous application of fluid by the moistener roll 18 to thesubjacent roll 19 and thus not only conserves the fluid supply, butavoids the application of fluid to roll 19 and by the latter to the rearsurface of the sheets passing between said rolls.

From the foregoing brief general description of operation of the machineit will be seen that at the beginning of an imprinting operation, thedrum 11 is rotated as by the crank 10 or by power means if desired, andthat during the first portion of a complete rotation of the drum, thefeed wheels20 on shaft 21 are positively driven to feed forwardly thetop sheet of a stack 17 of copy sheets to a position where the forwardend of the copy sheet is within the bight of the moistener and presserrolls 18 and 19 as indicated in Fig. 12. During the next or secondportion of the rotation of the drum the rolls 18 and 19 are positivelydriven to advance the sheet into the bight of the drum 11 and the masterM thereon and impression roll 22 while during the third or last portionof the cycle the drum and impression roll advance the sheet and depositit upon the receiving tray 15. Due to the improved driving mechanism ofthe parts as later described, the feed rolls 20 are positively driven adistance to feed the sheet into the position shown 7 -in Fig. 12whereupon the actual feeding movement of the rolls 2'0 ceases but therolls become free-wheeling as the balance of the top sheet is drawnforwardly from the stack by the then driven rolls 18 and 19. Hence afterthe sheet has been fed from the stack, the feed wheels 20 becomeinactive until, during the next cycle or rotation of the drum they againare positively driven. The feed wheels thus do not advance a sheet fromthe stack except during the first portion of each cycle of the drum. Themoistening roll 18 and presser roll 19 provide a positive feed of thetop sheet until the sheet has been advanced into the bight of the drum11 and impression roller 22 whereby the rolls 18 and 19 cease rotationas the sheet completes its passage therebetween. Hence the moistenerroll 18 does not need essly or diseffected as above described is shownin Fig. 4, but in describing such mechanism reference will be made toother figures also. The crank is secured to a shaft 24 which isjournalled in the side frame members 12 and V 13 and supports the drum11 as shown in Fig. 13. At the side of the, machine opposed to the crank23, the end of the shaft 24 which extends through the frame side member13 has secured thereto an eccentric 25 in the form of a wheel or disc asshown in Fig. 4 which rotates with the shaft. The extreme end of theshaft drives a belt 26 which operates a counter 27 secured to the frame13 which indicates'the number of drum revolutions and so will indicatethe number of sheets fed into and through the machine during a period ofuse following the resetting of the counter to a given position and thusreadily enables the operator of the machine to produce only a selectednumber of copies from a master on the drum. Journal-led on the peripheryof the wheel or eccentric 25, as by means of rollers 28 is an operatingmember indicated generally by reference numeral 29 and comprising a ringshaped portion 30 carrying the rollers 28 and a radially directed leverarm 31. The arm 31 at its lower end is operatively connected by pivot 32to one end of a rock lever 33 which is pivotally mounted at 34 to theside frame member 13. The other end of the lever is provided with aroller 35 which operates in a slot 36 provided in the lever-likeextension 37 of an oscillatory gear member indicated generally by num-,.

ber 38 which is pivotally mounted at 39 to the side frame member 13. Themember 38 has a segmental gear section 40 described about the axis ofthe pivot 39. As the shaft 24 is rotated in a clockwise direction asviewed in Figs. 4 and 18, the eccentric disc 25 moves the ring portion39 of the'operating member 29 about the shaft 24 as a center and effectsrocking of the lever 33 about the pivot 34. The roller 35, on the end ofthe lever, during a portion of the arcuate movement thereof, effectsrocking movement of the gear member 38. Viewing Fig. 4, it Will beobserved that in the relative positions of the member 38 androller 35therein shown, the portion of the slot 36 below the roller is concentricwith the axis of the pivot 34 and that doWn-.

ward movement of the roller 35 arcuately about the pivot 34 will notactuate the gear 38. The return or upward movement of the roller 35 withthe lever 33 through the lowermost just mentioned position to theposition shown in Fig. 4 will not rock the gear member 38. As shown inFig. 4 the upper portion of the slot, that is, from the portionembracing the roller 35 upwardly deviates slightly to the right, asshown in said gear member will be rocked orswung, in the first:

figure and as the roller 35 is moved. above the position illustrated, oris swung downward to that position, the

by the gear member 38 occurs after a copy sheet has been fed by feedrolls 20 into engagement with the moistening roll couple 18-19 and aftersaid couple has advanced the sheet into engagement by the drum 11 andimpression roll 22 and the imprinting action or duplication on saidsheet is being effected.

The moistening roll' 18 is mounted on and fixed to a shaft 41 journalledin the side frame member 12 and 13 and extending beyond the latter andprovided at the said end .with a clutch member indicated generally bynumeral 42 as shown in Fig. 4. The clutch is of the type which drivesonly in one direction, that is, it drives shaft 41 inthe clockwisedirectionas the clutchis driven in the clockwise direction. As theclutch is driven in the counterclockwise direction it slips and is noteffective to drive the shaft 41 which;may,'however, actually be rotatedindependently in the clockwise direction.

The clutch 42 is of the roller driven type shown in Figs. 19 and 20. Asshown in said figures the clutch comprises a core or hub member 43 whichis pinned to the shaft 41 at 44, the hub having a control rollerengaging portion or race 45. The faces of the clutch are formed of outerend plate 46 and inner end plate 47 to the latter of which is fixed apinion 48, which, as shown in Fig. 4 constantly; meshes with the teethof the arcuate rack 40 of member 38. Intermediatethe plates 46 and 47 isa laminated member 49 formed of a plurality of metalplates 50 of suchgauge that they can readily be stamped to like configuration and assembled as shown. The --plates 50 are shaped during the stamping operationto provide cavities forthe rollers -51 (three being shown in .Fig. 20)and recesses for the springs 52. The springs each tend to urgea rollerforwardly into binding engagement between the race-way 45 and the plates50 to effect one-way driving engagement with the hub 43 and thus withthe shaft 41. Thus when the clutch is driven through pinion 48in thecounterclockwise direction as viewed in Fig. 20, the rollers areeffective to drive the hub and shaft but upon the reverse rotation ofthe pinion 48 the rollers are freed frorn'the driven engagement with thehub .and the shaft is free to remain idle or to be rotatedindependently'of the clutching mechanism.

-- The individual plates 50 constituting the laminated porition 49 ofthe clutch are identical and are provided with openings for bolts orrivets 53 for securing the assembled plates 50 and end plates and 47together and complementary partial extrusionsi53a, the extrudingportions of each plate fitting in the corresponding cavities of anotherplate to enable the group of plates to be assembled accurately in theassembly of the clutch parts.

Asccond one-way clutch similar in all respects to that above described,isused on the feed shaft 21 as later described. Such second clutchfunctions in like manner and hence the description of Figs. 19 and 20may be considered as a description of the details of'such second clutch.i

As shown in Fig. 4, the pinion 48 of the clutch 42 but is released orstops as the pinion 56 is driven couriterclockwise and so enables theshaft 21 to be rotated clockwise by other means as the pinion 56 isdriven bythe gear 55 in the counterclockwise direction.

Figures 4 and 18 illustrate the gear 38 in its .two opposed extremepositions and since it is constantly in mesh with the pinion 48 itdrives the gear train including the pinion 48, gears 54, 55 and pinion56 during the active portions of-its movements between the two extremepositions. Referring to Fig. 4 it will be noted that in the positionshown the portion of the arcuate slot 36 below the line X is concentricwith the axis 34 of the lever 33 and hence when the gear38 is in theposition shown in said figure the movement of the roller 35 to anextreme lowermost position and back to the illustrated position the gear38 will remain stationary. The line indicated by X in Fig. 4 indicatesthe upper extreme of the concentric portion of the slot when in saidposition, while the portion of the slot above the line X isnon-concentric with axis 34 and diverges in a more upright direction.Hence as the roller 35 moves upwardly from the position of-Fig. 4 itbegins to swing the gear 38 clockwise about the axis of thepivotalsupport 39. As the gear member 38 is turned clockwise by lever 33 as.the lever swings counterclockwise, the roller will move relatively aslight distance toward-the base of the slot as the gear 38 approachesits maximum clockwise position as will be clear from examination of Fig.18. Thus the rocking of lever 33 as described causes the roller 35 totravel within the slot 36 and in its movement upwardly above the line Xof Fig. 4 it swings the gear 38 clockwise as tion 40 and will be drivenin the counterclockwise direction as the gear member 38 is swungclockwise, and is driven clockwise as the gear member 38 isswungcounterclockwise. It is the movement of the pinion 48 in theclockwise direction only which drives the shaft 41 and the moisteningroll 18 carried thereby while movement of the pinion in thecounterclockwise direction effects the above described declutching ornon-driving action and enables the shaft to be rotated clockwise asviewed in Fig. 4 independently of the pinion 48 by a copy sheet afterengagement thereof by the drum and presser roll.

The pinion 48 also meshes with the teeth of gear 54 which in turn mesheswith the teeth of a similar gear 55, both of which are journalled onstub shafts 54a and 55a respectively. Shaft 54a is carried by the sideplate 13 while shaft 55a is journalled in a swingable arm of feed rollercarrying means later described. Gear 55 meshes'with a pinion 56 which isa portion of a second clutch member indicated generally by number 57 andis secured to the end ofthe shaft 21 which carries the sheet feed meanssuch as the two wheels 20, as above stated :(see Figs. 1 and 2). Thewheels 20 preferably are of rubber having serrated peripheries. -Theclutch member 57 is the second clutch member referred to above and isidentical with clutch member 42 as illustrated in'Figs. 19 and 20. Theclutch 57 drives the shaft 21 as the. pinion 56 is driven clockwise, asviewed in Fig. 4,

indicated in Fig. 18 while return movement of the lever 33 fromtheposition shown in Fig. 18 to that shown in Fig. 4. swings the gear 38counterclockwise to the position shown in Fig. 4. However, as the lever33 continues its downward or clockwise swing from the position of "Fig.4, and returns to that position the gear 38 remains stationary and hencelikewise does the gear train driven by the rack 40. This interval .ofnon-driving action of the feed roll and the moistening means occursduring each cycle after the copy sheet has been engagedby the drum 11and cooperating impression roll 22 and the sheet is being imprinted.

- At this point a brief description of the copy sheet feeding operation,the sheet moistening operation and the imprinting or duplicationfunctions of the machine during a single rotation of the drum 11 willmake clear the sequential functioning of the mechanism shown in Fig. 4.Assume that a stack of copy sheets 17 has been placed in proper positionon the feed table 14 and that the feed" rollers 20 and shaft 21 havebeen released from the elevated inoperative position shown in Fig. 4 toenable the v rollers 2t) to rest upon the stack as shown in Figs. 1 and*Rotatingthe crank 23 through 180 of'arc in the counterclockwisedirection as viewed in Fig. 1 will ro-. tate the shaft 24 and cam'25through the same are and thus will raise the cam follower lever 29during the first of movement of the cam and during the succeeding 90- ofmovement will lower the cam follower lever to the same elevation asshown in Fig. 4 but shifted to the right. 'During such movement of thelever 29 the lever 33 will have been rocked first clockwise from, andthen counterclockwise, to the same position shown in Fig. 4. The partsof the mechanism may then be said to be in a starting position of acycleabout to be described since initial movement of the cam 25 from theassumed position will cause the lever arm 31 to move downwardly and rockthe lever 33 counterclockwise from the position of Fig. 4 to theposition shown in Fig. 18. Such movement of the lever 33 as statedcauses the gear member 38 to swing from the position of Fig.4 to that ofFig. 18 and in so moving drives the pinion 48 of the clutch 42 in acounterclockwise direction. Such movement of the pin-f ion, as describedabove, causes the'clutch to slip and the shaft 41 will remain idle aswill also the moistening roll 18 cammed by the shaft. The describeddriven movement of the pinion'48 will rotate the gear 54 clockwise, thegear 55 counterclockwise and the pinion 56 of clutch 57 clockwise, allas viewed in Fig 4. Such clockwise rotation of the pinion 56 causes theclutch to drive the shaft 21 and the feed wheel or wheels 20 thereon ina clockwise direction and thus to feed a copy sheet from the stack 17 ofsuch sheets as viewedin Fig. 12. The

copy sheet, designated 17a in Fig. 12, is advanced sufiiciently by thedescribed driving action of the feed wheels 20 to move the forward endof the sheet into the bight of the then stationary moistening andpresser rolls 18 and 19 and to bulge the intermediate portion of thesheet upwardly as indicated in'Fig. 12 to causethe forward end of thesheet to tend to move into the bight of the rolls. The crank will havemoved about 90 of are from the starting position during this portion ofthe cycle. During the next portion of the cycle of crank movement ofapproximately 90 of arc the eccentric disc or cam 25 moves the followerlever 29 from the position shown in Fig. 18 upwardly to the position ofFig. 4 and thus by swinging lever 33 clockwise to the position of Fig. 4the gear 38 is swung counterclockwiseto the position shown in saidfigure. Suchcounterclockwise movement of the gear 38 from the positionshown in Fig. 18 to the position of Fig. 4 causes the teeth of the rack40 to drive the pinion 48 of the clutch 42 in a clockwise directionwhich as explained above effects the driving of the shaft 41 of themoistening rcll 18. 'Such clockwise movement of the roll 18 and thecompanion contacting presser roll 19 which is driven by the roll 18,feeds the sheet 17a. forwardly into the bight of the drum 11 and theimpression roll 22 which latter is driven ,by contact with the drum. Themoistening roll 18, in feeding the sheet 17a forwardly as just describedapplies moisture to the upper surface of the sheet as will be describedlater. It will be seen that the movement of the gear member 38 from theposition shown in Fig. 18 to the position shown in Fig. 4 drives thepinion 4S clockwise which causes the clutch 42 to drive the shaft 41 andso drives theroll 18 in the clockwise direction. Such clockwise movementof the pinion 48 effects, through the motion transmitting gears 54 and55, counterclockwise movement of the pinion 56 of the clutch 57 on thefeed roll shaft 21 but such counterclockwise movement causes ade-clutching effect of said clutch and hence as the bottom portion ofthe sheet 17a is pulled from beneath the feed wheels 20 by the rolls 18and 19 said wheels and the shaft 21 are free to be moved clockwise bythat portion of sheet 17a still' under the wheels. It will be seen thatthe clutches 42 and 57 are effective to drive these respective shafts 41and 21 as the drive pinions 48 and 56 are driven clockwise but arede-clutched as the respective pinions' are driven counterclockwise asviewed in Fig. 4. In other words, as the gear member 38 moves clockwisefrom the position of Fig. 4, clutch 42 is inactive while clutch 56 isdriven clockwise to feed a sheet from the stack into the bight of themoistening and presser rolls 18 and 19. As the gear 38 is swung from theposition of Fig. 18 back to the position of Fig. 4, the clutch 42 isdriven clockwise to drive the moistening roll 18 and the companionpresser roll 19 to feed the sheet into engagement with the drum 11 andimpression roll 22, the clutch 57 meanwhile being de-clutched by thecounterclockwise driven movement of the pinion 56.

The sheet 17a is advanced by the rolls 18 and 19 during this secondportion of the cycle of the drum and at or about the time that theforward portion of master M in the drum reaches the bight of the drumHand presser roll 22, the forward end of the sheet 17a will enter thebight and be engaged by the drum and impression roller to continue theforward advance of the sheet. It will be understood thatthe uppersurface of the sheet is moistened by the roller 18 and that it will bepressed into sociated driven parts of the roll actuating mechanism will;

be in the relative positions shown in Fig. 4. .During the succeeding ofthe rotation of the drum the action of the'cam 25 effects clockwisemovement of the lever 33 and movesthe roller 35 downwardly within theportion of the slot 36 which, in the position of the gear member 38shown in Fig. 4 is concentric with the lever pivot 34. Hence the gear 38remains stationary during this third portion of the cycle of rotation ofthe drum as well as during the fourth or final portion of rotative cycleof the drum since during such fourth portion the roller 35 movesupwardly from a lowermost position (short of the lower end of the slot36) to the position shown in Fig. 4. During the last, half cycle ofrotation just described, the copy sheet is imprinted, having picked upthe necessary liquid from the roller 18. Succeeding rotative cycles ofthe drum each effects performance of similar functions in the sequencedescribed, thus first, the feed rolls 20 are actuated to feed the topsheet from the stack until the advancing end is pressed; into the bightof the then inactive rolls 18 and 19; the rolls 18 and 19 then becomeactive to feed the sheet (and currently moisten the top surface thereof)into engagement with the rotating drumrotated by the action of theremainder of the sheet being.

drawn forwardly by the rolls 18 and 19 and hence stop rotating as thesheet passes from beneath the feed rolls to avoid advancing the nextsheet in the stack until the beginning of the next: cycle of the drum.Likewise, as the sheet is engaged and drawn forwardly by the drum 11 andimpression roll 22, the moistening roll 18. becomes non-d'riven by themechanism but by reason of the action of the clutch 42 the roll isrotatable by the balance of the sheet as it is drawn forwardly frombeneath the roll 18 by the drum 11 and roll 22. The mechanism shown inFig.3 thus drives the feed and moistening rolls in sequence during acycle of operation of the drum and.

effects the orderly progress of the sheets, in properly timed relation,from the stack on the feed table and through the machine.

In Fig. 3 the feed rolls 20 are shown in an elevated inoperativeposition to which they'may be raised manually by the operator when themachine is to be unused for a period, to avoid deformation of the rolls.7 In Fig.

Fig. 3), which arms are pivotally journalled on the stub shafts 54a andmounted in the respective side frames 12 and 13. Stub shaft 55a of thegear 55 is carried by the adjacent arm 61 and hence the gear 55 remainsconstantly in mesh with the gear 54' as well-as in mesh with pinion 56in all positions of the supporting frame carrying the feed rolls 2%. Thearms 61 are generally similarand each isprovidedv with an upwardlyextending portion 62 between which portions is a tie rod 63 which givesrigidity to the frame. The frame arms 61 are located outwardly of theside frame members 12 and 13 which are provided with arcuate openings 64to accommodate the shifting movements of the shaft 21 and the tie rod63.

When thefrarne carrying the feed. rolls. or wheels 20 new fiQ a iselevatedto movelthe rolls to 'inope'rative positionfa .spring actuatedlatch 65, pivotally'secured at 66=to the side frame member'13 is swungclockwise by the -spring 67 to move. a detent 68, which is: integralwith the'latch, to engage within a notch 69 provided in the adjacent arm61 for releasably retaining the feed frame in anelevated inoperativeposition. The upper end of the latch 65 extends laterallythrough a slot70 in the frame member 13 to render the latch manually operable torelease the feed rolls from inoperative or elevated position. See Fig.3.

The feed tray 14 above referred to is of sheet metal and has dependingend and side walls: and, asindicated in Fig. 3, is adapted to beremovably supported in operative position by studs 71 carried by atransversely extending sheet guide member 72 attached to the side framemembers 12 and 13. The dependingend Walls vofthe tray each is providedwith openings 73 which receive the studs 71 when the respective end wallof the tray is placed in the stud receiving-position. Supporting clips74, secured to the side frame members 12 and'13, engage the dependingside walls of the tray as shown in Fig. 3 which together with the studs71 releasably secure the tray in position. Stud receiving openings 73are provided in'both depending end walls of the tray, as stated, wherebythe tray can be mounted. with either end in the forward position for thepurpose subsequently described.

The tray 14 is provided with opposed laterally adjust able sheet guiderails 75 which can beradjusted to accommodate therebetween the sheets Mto be used. Each rail can be locked in laterally adjusted positions by aas shown in Fig. 1. Within each housing is a soft'rubber block or pad 78which is spring pressed outwardly of the housing by spring means locatedtherein when the tension on the springs is released by operation of amanually releasable knob 79. When the springs of the pads are compressedby proper rotation of the knobs 79, the rubber pads are moved inwardlyof the rails but upon rotation of the knobs to spring releasingpositions the pads are moved outwardly and contact opposed side-edges ofa stack of sheets between the properly adjusted side rails for offeringa slight but adequate restrain to, retai n the stack of sheets againstcreeping movement on the feed table or tray 14as themachine operates:.Hencein' use, the paper restraining pad'srestrain the advanceor otherdisarray of sheets inthe. stackalth'oug-h the topmost. sheet can bemoved forwardly by the positive action of. the feed rolls 20 whenactuated as previously described.

The feed table or tray 14 can be-reversed end-for-end when such becomesdesirable by reason. of the lengthof copy sheets being used. When sheetsofnormal correspondent lengths or longer are being used, the feed table14. normally is employed inthe position shown in Fig. 1,

. 16 'positionwhendesirable. Such receiving tray1'5 is sup portednormally for in and out adjustment by supports 81, one secured to eachside frame of the machine. The

. supporting rhembersare disposed for supporting the tray 15 in asuitably inclined position as indicated in Fig. 3'. Reference has beenmade above .to the moistening roll '18 and presser-roll 19 and the meansfor driving the rolls are moistened by the roll 18. The means forsupplying the moistening fluid to the roll 18 will now be described.

Located,,-forwardly of the roll 18 is a transversefluid holding trough81 as shown in Fig. .3 which is suitably attached at the ends to theside frame members 12 and 13. Extending from the trough 81 is a felt orlike wick 82 of a length substantially that of the roll 18 and of awidth to overlie an upper portion of the roll. Theupper edge of the wickis held in suitably firm contact with the roll preferably, as by apresser plate 83 which extends transversely of the machine and at eachend has an upturned ear 84 by means of which the plate is pivotallyattached to the side-frames 12 and 13. The opposite ends of the otheredge of the plate are provided with ears 85 which are provided withstuds 86 which (are to'be swung up against the action of the springs 86ato 'release the wick when readjustment, or removal for guides betweenwhich thecopy sheets'pass.

cleaning or renewal becomes desirable. Before removing the wick it isnecessary to remove an upper sheet guide 88 which'n-ormally cooperateswith the lower guide 72 in directingthe forward ends of copy sheets tothe bight of rolls 18 and 19 as the sheets are advanced, as abovedescribed, by the feed wheels 20.

The guide 88, in the form illustrated as in Figs. 3 and 12, i's of sheetmetal and at the ends is provided with leaf springs 89 havingdepressions 90 which engage studs 91 projecting'inwardly from the framemembers to hold the guide in operative position. The lower edge of theguide is provided with end recesses to engage studs 92 located at theends of'the forward edge of the guide 72, intervening spacer members 93at the ends eifecting the spacing apart of the adjacent edges of the Itwill be seen that; by pulling back on the upper portion of the guide 88to release the springs 89 from the studs 91,

the guide canbe'lifted from the studs 92 and removed, thereby renderingaccess to the presser plate 83 for re leasing the. wick 82 foradjustment or' removal. 7

but when sheets of shorter length are employed it may be found advisableto reverse the table end-for-end so as to locate the pads 78- somewhatforwardly ofthe position shown in Fig. l to enable them to provideadequate re-" straint to forward or rearward creeping action of thesheets as the machine is being operated. I

The side rails 75 are provided with opposed notches 80 at the forwardandrearward portions thereof for accommodating in. either position. of thetable the free descent of the shaft 21 to enable the feed rolls 201toact upon even the lowermost. sheets of the stack.

The feed table 14, as is made apparent from the foregoing description,isreadily removable from'an operative position for placement on the top.of the machine or otherwise in packaging the machine for'shipment-or forstorage while the receiving tray 15,'which is supported at the opposedend of the machine whileinuse can be removed if desiredor slid inwardlyto an out-of-thewvay The upper guide 88 has a depending, transverselyextending wing section 94 which carries a second wick 95' held inposition by a clip 96 and a lower forwardly turned lower edge of thewing 94. The wick or wiper 95 bears against the roll 18 and distributesor spreads the liquid on the roll picked up thereby by contact with thewick 82. A wiper wick 81a" attached to the tank 81 is shown in Fig. 12for removing lint from roll 18.

Fluid is supplied to the trough 81 through a horizontal duct 96extending from one end of the'trough through the side frame member 12 toa cup or receptacle 97 secured to the outer face of the frame member.Into the cup 97 fluid is released from a fluid holding tank 98 formaintaining a selected fluid level in the trough while the machine is inan operable condition or in use, the tank being arcuately adjustable toan inoperable position to avoid needless replenishment of fluid in thetrough dur-i a fluid feeding position. -In Figs. 9 and 10 one end oft=l1=li21-nk is shown extending through an openingi'rrthe frame member12 and at said end is provided wth gravity feed means comprising aconnector member 99 through which fluid from the tank can flow into atubular section 100 and thence into avalve chamber member 101. The lowerend of the member 101 has a fluid outlet passage 102 and a surroundingvalve seat 103. A ball valve 104 in the chamber is secured on a valvestem 105 which extends through a diametrical passage in the ball. Thelower portion of the stem 105 below the ball valve pro- .jects throughthe outlet opening 102 and in contacting the base of the cup 97, willlift the ball from the seat to permit the flow of fluid into the cup. Onthe upper portion of the valve stem 105, above the ball valve, is acompression spring 106, the lower end of which seats on the ball and theupper end of which is centered in the member 101 by suitable means, asthe head of a rivet 107 in the cap 108 of the member 101. The rivetsecures a brace 109 to the fluid discharge structure to rigidify it, theother end of the brace being attached to the tank 98. The ste'm 105 isof such length that when the tank 98 is rocked clockwise to the positionshown in Fig. 9, the stem 105 engages the bottom of the cup 97 andunseats the valve against the action of the spring 106 whereby fluidfrom the tank can flow into the cup and from the cup through the duct 96into the trough 81. The flow of fluid from the tank will be interruptedwhen the fluid in the tank and cup cover the discharge opening 102. Asthe fluid in the trough 81 is consumed in use or by evaporation, thelevel of fluid in the trough is restored by automatic discharge from thetank while the tank is in the position shown in Fig. 9. Uponcounterclockwise rotation of the tank from the position shown in Fig. 9toward an inoperative position, the spring 106 will close the valve toprevent evaporation of fluid from the tank until the tank is returned tothe operative position shown in Fig. 9.

As stated, the tank is mounted for limited pivotal movement on itslongitudinal axis. At the side of the machine shown in Fig. 9 the tankif pivotally supported by an axial stud 110 supported by a bracket 111which is secured to the outer face of the frame member 12, the studextending into a bushing secured to the end wall of the tank. At theother end of the tank, which extends into an opening in the frame member13, an axial stud 112 carried by a bracket 113 on the outer face of theframe member 13 (see Fig. 4) extends into a bushing secured to theadjacent tank end wall 114 and provides a supporting pivot. The tank isthus rockable about the longitudinal axis on the pivots 110 and 112.

For the purpose of facilitating the movement of the tank between theoperative fluid delivering position shown in Fig. 9 to an inoperativeposition wherein the valve is in the position shown in Fig. 11, the endof the tank shown in Fig. 9 has a radially extending arm or bracket 115which carries a stud 116 extending inwardly of the machine through anarcuate passage 117 in the frame member 12 and has a finger piece 118thereon whereby when the side frames 12 and 13 of the machine carry theornamental casing members 1211 and 13a as shown in Figs. 1 and 2, thetank 98 can be operated conveniently. The finger piece 118 is shown inFig. 2.

When the tank is in the operative position shown in Fig. 9 the bracket115 is adapted to abut and adjustment screw 119 carried by a bracket 120secured to the outer face of the frame member 12. By adjustment of thescrew the operative position of the tank can be varied for raising orlowering the level of fluid in the trough. By'raising the fluid level inthe trough the wick 82 will apply more liquid to the roller 18 andthence to the copy sheets. In Figs. 21 and 22 a more convenientmechanism for adjusting the tank for varying the level of fluid in thetrough is shown and will be later described.

A helical spring 121 is shown in Fig. 9 which is attached at one end tobracket 111 as by a stud 122 and to a lateral projection 123 of thebracket 109. The tension line of'thespringbetween the points ofattachment of the ends of the spring is below the pivotal axis of thetank when the latter is in the operative position shown in Fig. 9 andhence tends to hold the tankin the opera tive position. As the tank isbeing manually rotated toward the inoperative position for the purposeof shutting off the feed of fluid to the trough, at the position wherethe projection 123 passes counterclockwise to a position above astraight line through the pivotal axis of the tank and the stud 122 atthe other end of the spring 121, the spring acts to continue thecounterclockwise movement of the tank until the stud 116 'seats at theother end of the slot 117. The structure described constitutes a quicksnap-over mechanism which tends to hold the tank in the operativeposition of Fig. 9 or the fully inoperative position suggested by Fig.11. By simply swinging the finger piece 118 arcuately as described, theflow of fluid fromthe tank to the trough is prevented and the fluid inthe tank is conserved against evaporation during periods of non-use ofthe machine.

The tank 98 which is formed primarily of brass or other non-corrosivemetal is provided with a filler opening normallyclosed by a screw cap124 (seeFig. 1). The tank also preferably is so constructed as toprovide one or more sight openings which reveal visually the amount offiuid remaining in the tank for the convenience of the operator and soreduces the chance that the fluid in the tank will become exhaustedduring use of the machine. One sight opening is indicated by the numeral125 and is formed by providing an opening in the cylindrical wall of themetal tank. A glass cup-like receptacle 126 is inserted in thecorresponding end of the tank with the side .wall of the receptacleextending over the sight opening or openings. The receptacle is cementedin place within the tank to prevent leakage, the bottom of thereceptacle being disposed inwardly'of the adjacent metal end wall 114 ofthe tank which is secured in place, as by solder, following theinsertion and cementing of the receptacle.'

For the purpose of enabling the operator of the machine to vary thepressure of the rolls 19 and 22 against the respective moistening roll18 and the drum 11 as may be desirable from time to time in theoperation of the machine, mechanism is provided for eflectingsuch'results by movement of a single manually operable member.

Viewing Fig. 12 it will be seen that an end journal of the axial shaftof roll 19 is supported in an open recess in the upper end of asupporting member 128 which is pivotally attached at 129 to the framemember 12. Referring to Fig. 3 it will be seen that a mating supportingmember 130 is pivotally supported at 131 to the frame wall 13. Thesupporting members which are located at the inside walls of the framemembers 12 and 13 are in opposed positions for supporting the presserroll 19 normally in contact with the moistening roll 18. Viewing Fig. 3it will be seen that swinging the supporting members 128 and 130forwardly or to the right, the roll 19 will be pressed more firmlyagainst the roll 18. When the members 128 and 130 are swung in theopposite direction the pressure of the roll 19 against roll 18 will berelieved and that by swinging said members 128 and 130 sufficiently tothe left, the roll 19 can be lifted from the members for removal forcleansing or renewal.

The impression roll 22 is similarly supported in members .132and 133,which are pivotally secured'at 134 and 135 respectivel'y'to the oppositeside frame members 12 and 13. Swinging bmovement of the members 132 and133 tome-right, as'viewed in' Fig. 3 will increase the pressure of roll22 against the drum while reverse swinging movement will relieve thepressure and if through an adequate arc'will'enable the roll 22 to belifted from position for cleansing or renewal.

As 'shownin..Fig; ,,3 a spring 136 .is releasa'bly secured inopeningsginthe: members 130 and 133; while in Fig. 12

the pressure exerted thereby against the roll:18 and drum 11respectively comprises a transverse shaft 138 journalled in the sideframe members 12 and 13. The shaft has secured thereto intermediate theframe side plates 12 and 13 a flanged eccentric cable-tensioning drum139. A cable 140 has one or two convolutions around the drum 139 and theends extend rearwardly into attachment with means which insureconcurrent movementof the members 132 and 133. As shown in Fig. 3, theopposed members 132 and 133 are slotted to receive the ends. of anL-shaped cross bar 141. The horizontal flange of the bar is slotted at142 to receive a depressed dog or tongue 143 of a bar 144 having aforward up-turned end-145 which is apertured to receive one end of thecable140. The end of the cable has an anchoring member 146 thereon. Theother end of the cable 140 has attached thereto a threaded member 147which extends through a vertical plate 148 having a transverse slotreceiving therear of the horizontal bar 144 and abutting the rear of thecross bar 141. A nut 149 on the threaded member 147 provides means foradjusting the tension of the cable. A flexible washer under the nut iseffective to maintain the tautness of the cable in use evenafter'limited expansion thereof. Arcuate adjustment of the shaft 138from the position shown in Fig. 3, will move the cable runs forwardlyand thus swing the supports 132 and 133 forwardly or counterclockwise(Fig. 3) and press the-roller 22 more firmly against the drum. When :such movement is imparted to the members 132 and 133 the springs 136 and137 will swing the supports 128 and 130'in the same direction andincrease the pressure of the presser roll 19 against the moistening roll18. In Fig. 3 the cam 139 is shown in a position for exerting minimumpres sure of the rolls 19 and 22 against the cooperating roll 18' anddrum 11 but, during periods of non-use, as overnight or weekends, it maybe desirable to free the rolls 19 and 22 from contact with the roll 18and drum 11 respectively to avoid the deformation of the rolls. This canbe accomplished by lifting upwardly on the right-hand end of the bar 144to free the tongue 143 from the slot 142. The brackets which carry therolls 19 and 22 are thus freed from the holding action of the cable andcan swing out of contact with the moistening roll and the drum as willbe obvious. By grasping the bar 148 with the fingers and exertingpressure with the thumbon the up-turned end 145 of the bar 144, thetongue 143 can be caused to be re-latched within the slot 142 inrestoring the parts to operative position. Various cable tensioningpositions of the drum 139 are shown in fig. 7. A guard 150 about theconvolutions of the cable on the drum 139 is shown in Figs. 6 and 7 alsobut isdetached inFig.8. For the purpose of adjusting the shaft 138 andeccentric drum 139 for varying the pressure exerted by rolls 19 and 22against the moistener roll 18 and drum 11 as above described, one end ofthe shaft extends through the frame member 13 and bears a flanged drum151. See Fig. 4. A cable 152 has one or two convolutions about the drum151 and is intermediatelyanchored thereto at 151a and the end portions,being crossed, extendinto engagement with a lever arm 153 which ispivotally mounted on the end of the shaft 24 which carries the drum 11.One end of the arm bears a finger-piece or knob 154 extending through anarcuate slot 155 in the frame member 13 where the knob is accessible toan operator'of the machine. rolls 19 and 22 against the copy sheetspassing through in Fig. 13.

The operator can increase the pressure of the 14 the machinefor varyingthe intensity "of the imprints by adjusting the knob 154 within theslot155. In the upper position of the knob within the slot as indicatedin Fig. 4, the rolls 18 and .22 exert minimum pressure against the roll18 and drum 11, whereas by lowering the knob, the pressure is increased.Increasing the pressure by lowering the knob intensifies the imprintingresult.

As previously described, rotation of the shaft 24 by the crank 23eifects the rotation of the drum 11 as well as the gear train shown inFig. 4 which etfectsthesequential positive driving movement of the feedrolls 20 and the moistening roll 18. The drum carries a master M duringthe functioning operation of the machine. Such masters may vary in'thedisposition upon the same of the copyable matter which they bear. Amaster may have the copyable matter beginning near the top ofthe mastersheet while it may be desirable to locate such matter relatively loweron the copy sheets, as where such sheets are in the form of letterhead;for example. In some instances the reverse of the above may be desirablein producing copies which-are of well .balanced design or arrangement.Hence the present invention provides means for ancuately adjusting thedrum 11 upon the drive shaft 24 whereby the copyable matter on a masterM will be imprintedgon the copy sheets in relatively higher orlowerpositions. For effecting the adjustment of the drum 11 upon thedrive shaft 24 for accomplishing the results above adverted to, thedrum, while carried by the shaft 24' is not positively. secured directlyto the shaft but is secured to a'tube 156 which is mounted on the shaftas shown The drum 11 has a central transverse web 157 and an integralhub 158 through which the shaft 24 and the tube 156 extend. A set screw159 secures the drum to the tube. against relative rotation with respectthereto. The tube 156 extends outwardly through a bushing 160 providedin an opening in the frame member 12 and has secured thereto, by a setscrew 161, a hub portion of a worm gear support 162 which is locatedwithin an enlarged hub-like casing portion 163 of the crank 10. Thecasing 163 is generally hollow as shown in Figs. 15, 16 and 17 but isprovided with strengthening ribs 164 which engage the support; 162 forcooperation with a screw 165 in holding the support in position withinthe hub-like casing. The support 162 carries a worm 166 which mesheswith a worm gear 167 secured to the reduced outer end of the shaft 24.On the ends of the shaft of the worm are two manually operableadjustment wheels 168 which extend partially through openings in the endwall of the casing '163 as shown in Figs. 1, 2 .and 13 to enable thewheels or one of them to be manually operated in either direction. Byrotation of the wheels 168 while holding thecrank 10 against movement,the gear 167 and shaft 24 will be rotatedrelative to the drum 11 or ifthe wheels are rotated without holding the crank against rotation thedrum will be rotated relative to' Such relative adjustment between thedrum the shaft. and shaft can be effected in either direction simply byrotating the adjustment wheel or wheels 168 in a correlative direction.v 1 1 1' Adjacent the other end of the drum 11, the shaft 24 has securedthereto a pointer 169, the outer end of which is adjacent the peripheraledge of the drum 11 which carries graduations 170 thereon located onopposed sides of a central zero or other indicia as shown in Fig. 2. Asviewed in said figure, if the wheels 168 are rotated in a direction toproduce movement of the drum 11 clockwise relative to the shaft 24 or tothe right as viewed in Fig. 2, the degree of such relative movement withreference to the zero marking the center of the graduations will beshown. Such moyeme'nt' of the drum relative to the shaft will move themaster with it'and so move the. master to a position requiring furtherrotative movement of the drum before the master contacts the copy sheetmoving through the machine. The result of such adjust ment of the drumon the shaft will be to lower the Idea tion of the matter imprinted onthe copy sheets. while adjustment of the drum in the opposite directionwill locate the. imprinted matter higher on the copy sheets.

If an operator'notes. on the master the position of the drum on theshaft by reference to the graduations, the same relative setting of thedrum can be elfected by operating the wheels. 16% when such master isagain employed in the making of copies and thus similar location of the,imprinted matter upon the copy sheets will be obtained. v

The master clamp bar 16 which holds the upper end of a master M upon thedrum can be raised by suitable mechanism to release a master on the drumor to raise it for receiving a master. Such mechanism is shown in Fig.14. The master clamp bar 16 is located in a slot or passage 17% providedin the cylindrical face of the drum and in a rib portion 171 as shown inFig. 12. As shown in Figs. 12 and 1.4 the bar has a master engagingextension or hp 172 which when the bar is in seated position clamps, theend of master M to the drum. A shallow lip receiving recess 173 receivesthe lip and the clamped upper edge of the master. The clamp 'bar '16 isprovided with a pair of studs 174 which extend through suitable passagesin the base of the rib 171 and are provided with nuts. 175 on the endsbetween which and the base of the lib are compression springs 176 whichnormally seat the bar in the clamping position shown in Fig. 12.

In Figs. 13 and 14 a lever 177 is shown which is pivotally'mounted at178, to side frame 12 and carries a roller 17disposed in a slot180 in asecond lever 181 which is piy'otally mounted at 182 to said frame member12. The lever. 181. at its upper end portion carries a roller 183 whichprojects inwardly. A U-shaped lever 184 extends through an opening inthe web 157 of the drum and has the'ends 18S pivotally connected to theends of the rib-171 on an axis defined by the two mounting studs 1 86and 137. A wire spring 188 mounted on the stud 18') tends to hold theU-shaped lever 184 upwardly although .the stronger springs'176 candepress the lever when theclamp bar is seated thereby.

The ends of the clamp bar 16 carry studs 189 which project from the barthrough the open ends of the slot 170 in the rib 171 for engagement withthe ends 185 ofthe swingable lever 184. The end 185 of the lever shownin Fig. 14, which is the left-hand end shown in Fig. 13, has securedthereto, as by rivets 190a a cam member in the form of a plate 190, theright-hand end of which, as viewed in Fig, 14 has an inclined cam edge191.

In Fig. 14 the lever 177 is shown in a position in whichithe clamp bar 1is elevated to a position for receiving a master M or for removing sucha master. If the. lever 177 is swung manually clockwise as viewed inFig; 14, the stud 179 operating in the slot 180 of lever 181 will causesuch lever also to swing in a clockwise direction and thus move theroller 183 out of engagement withthe cam plate 1% and permit the springs176 to restore the clamp bar 16 to a seated position in the slot 170'and thus to clamp the edge of a master sheet M to the drum. When thelevers 177 and 181 have been so swung they do not interfere with therotation of the drum.

-When it is desired to elevate the clamp bar 16 to release a master orpreparatory to attaching a master, the lever 177 is swungcounterclockwise from the described inoperative position to swing thecam operating roller 183 of the. lever 181. into the relative path ofthe cam. 19%. The drum 11 is then rotated clockwise from.

anassumed position not shown to move the cam edge 1&1 into engagementwith the roller 1&3 whereby the cam swingsthe' UI-shapedlever 13 icounterclockwise, asviewedinFig. l4, and causes the upper edges of the18.5,, to engage the studs 189v to lift the clamp bar as, illustrated.in. saidfigure. Upon. insertion ofthe edge of, afmaster. M under the.lip 172 of. the clamp bar. as

shown in Fig. 14; clockwise movement of the lever 177 permits thesprings 176 to restore the bar to clamping relation.

in Fig. 14 it will be noted that when the levers 177 and 181 are in theelevated positions shown, the relation of the stud 17? of the lever 177to the pivot 178 of the lever 177 is such as to firmly support the lever181 in the operative position illustrated. Hence the operatorpreparatory'to elevating the clamp car may merely move the lever 177 tothe operative position shown and then rotate the drum clockwise to movethe cam into the elevating position on the roller 133 of the lever 181.It thus is not necessary to manually retain the lever 177 in theclamp-bar elevating position which arrangement leaves both hands of theoperator free in inserting a master in clamping position. under the lip172 of the clamp bar. Suitable indicia preferably is stamped on the edgeof the drum 11 indicating a preferred rotative position of the samebefore the lever 177 is swung to the operative position, after whichpositioning of the lever, the drum is moved to the position shown inFig. 14

for elevating the clamp bar. However, should the drum 7 be in therotative position shown in Fig. 14 when the lever 177 is swung to theoperative position, the clamp bar ill be elevated as shown. The clampbar elevating mechanism acts on both ends of the bar in elevating itwhile the springs 176, which are located adjacent the ends of the barexert adequately distributed pressure on the bar to provide firmclamping action upon a master in operative position on the drum.

Figures 21 and 22 show structure which can conveniently be operated foreffecting the arcuate adjustment of the tank98 for varying the elevationof the discharge outlet 102 of the valve chamber sill within the cup 97for varying the level of fluid within the trough and thus varying theamount of liquid supplied by the wick 82 to the moistening' roll 18 andby the latter the amount applied to the sheets of copy paper passingthrough the.

machine. In said figures there is shown a slidable bar 192 which isattached by the headed studs 193 to the inner surface of the framemember 12. A spring 194, attached at one end to one of the studs 193 andat the otherend to a stud 195 projecting from the bar inwardly of themachine, slides the bar to the right intov contact with a rotatable stopmember 196 mounted on a shank 197 journalled in the side member 12. Theouter end of the shank is provided with a wheel or knob 198 by means ofwhich the member 196 can be adjusted to move any of theseveraldepressions or recesses 199 of the edge into operative relationwith the adjacent end of the bar 192 which is shaped to seat in any ofthe recesses. The scolloped edge of the stop member 196 is eccentricwith respect to the axis of rotation and hence by adjusting the knob tomove any recess 1% into contact with the. end of the bar, the latterwill be adjusted to the right by the spring or to the left by theeccentric, depending on the radial distance of the receiving recess fromits axis of rotation.

The opposed end of the bar 1&2 which is turned inward of the machinecarries a screw 200 and nut 201, the end, of the screw abutting the earor bracket of the tank. By adjusting the knob 198 home given position,the bar 192 can be shifted by the, cam 196 to the left or the latterwill permit the spring194 to shift the bar to the right and so move theend of screw 200 to the left or, right for varying the fluid dischargeposition of .thetank. By adjusting the cam 31% to shift the bar 192 themaximum distance to the left as viewed in Fig. 21, the valve chamber 161will be in the highest operating position within the cup and the flow offluid into the trough will not be shut or? until the level in the troughis. approximately at the top of the duct 96. With the fluid in thetroughat suchhigh level, the wick can supply more: fluid to the roll.18 thanwill be the case if the aesenoe cam 196 is adjusted to the positionwherein the bar 192 is shifted the maximum distance to the right whereinthe level of liquid in the trough will be at a lower level. Differentfluid levels in the trough are indicated in Fig. 22.

Preferably the knob 198 and the adjacent portion of the frame member 12bear indicia to indicate the positions of the knob which provide high,low and intermediate levels of liquid in the trough.

While the improvements shown in the drawings and above described areillustrative of the invention, it will be apparent that various changesin details thereof may be made without departure from the scope of theinvention defined by the appended claims.

We claim: s

1. In a duplicating machine, a rotary drum and a rotary moistener rolland a pressure roll associated with each, a holder for each pressureroll, adjusting means including an eccentric having a cylindricalportion, means connecting the holders with the adjusting means includinga cable at least partially encircling said cylindrical portion, a guarddetachably mounted on the cylindrical portion in enclosing relation tothe encircling portion of the cable, said guard being generally C-shapedand closely approaching 360 in circumferential extent with terminalextensions circumferentially facing each other and relatively axiallyolfset to provide cut-out portions circumferentially remote from theterminals of said extensions to accommodate runs of cable, and manuallyoperable means for rotating the eccentric.

2. In a duplicating machine, a rotary drum and a rotary moistener rolland apressure roll associated with each, a holder for each-pressureroll, adjusting means including an eccentric having a cylindricalportion, means connecting the holders with the adjusting means includinga strand connected at its ends to the holders and a mid-portion at leastpartially encircling said cylindrical portion, a pulley on saideccentric, a cable at least partially encircling the pulley, and apivotally mounted lever, the ends of said cable being secured to saidlever at opposite sides of the axis of the lever, said lever having amanually accessible portion for grasping and manual actuation forvarying the pressure exerted by the pressure rolls on the drum anddriving roll.

3. A duplicating machine comprising a rotary cylindricalmember, a rollmember engaging the cylindrical member, the members being operative topass a sheet therebetween upon rotation thereof, means mounting one ofthe members for movement into and out of pressure engagement with theother, manually actuated means and means interconnecting said manuallyactuated means and the one member, said manually actuatable means beingoperative for adjustably varying the pressure exerted by the one memberon the other when they are in such pressure engagement, saidinterconnecting means including means for releasably retaining the onemember in such pressure engagement in any given setting of the manuallyactuated means, said releasable retaining means including a firstelement secured to said mounting means and a second element secured tothe interconnecting means guidingly slidable through an aperture in thefirst element, said elements having interlocking portions releasablyengageable upon movement of the elements in relatively opposite rndlocking directions by gripping them between the fingers end compressingthem.

.4. A duplicating machine comprising a rotary cylim drical member, aroll member engaging the cylindrical member, the members being operativeto pass a sheet therebetween upon rotation thereof, means mounting oneof the members for movement into and out of pressure engagement with theother, a cable secured at its ends to the mounting means and forming aloop portion, manually actuated means engaging said loop portionoperative for adjustably varying the pressure exerted by the one memberon the other, and means forming connecting means between one end of thecable andthe mounting means for releasably retaining the one member insuch pressure engagement with the other in any given setting of themanually actuated means.

5. A duplicating machine comprising a plurality of cylindrical membersand a pressure roll associated with each, means for mounting eachpressure roll for movement into and out of pressure engagement with therespective cylindrical member, manually actuated means for adjustablymoving one of the mounting means for varying the pressure exerted by theassociated pressure roll on the respective cylindrical member, yieldablemeans serially interconnecting the plurality of mounting means fortransmitting the pressure varying movement from' the one mounting meansto the remaining mounting means, and means for releasably retaining theone mountmg means, and therethrough the remaining mounting means, inposition for establishing pressure engagement member for movement intoand out of pressure engage,

ment with the cylindrical member, manually actuated means including arotatable shaft, an eccentric on the shaft and having a cylindricalportion, a flexible strand having a mid-portion at least partiallysurrounding said cylindrical portion and its ends connected to themounting means, said shaft and eccentric being operable on I rotationthereof for adjustably varying the pressure of the roll member againstthe cylindrical member, and flexible means interposed between one end ofthe strand and the mounting means for maintaining the pressure of theroll member against the cylindrical member in any given setting of themanually actuated means notwithstanding limited expansion of saidstrand.

References Cited in the file of this patent UNITED STATES PATENTS2,573,810 Rundblad Nov. 6, 1951 2,659,304 Keil Nov. 17, 1953 2,661,686Levin et al. Dec. 8, 1953 2,721,514 Quirk Oct. 25, 1955 2,722,885 KeilNov. 8, 1955

